Update bundle (with newest rubocop version) and fix offenses

spec/controllers/codeharbor_links_controller_spec.rb

@@ -3,7 +3,7 @@
 require 'rails_helper'
 
 describe CodeharborLinksController do
-  let(:user) { FactoryBot.create(:teacher) }
+  let(:user) { create(:teacher) }
 
   let(:codeocean_config) { instance_double(CodeOcean::Config) }
   let(:codeharbor_config) { {codeharbor: {enabled: true, url: 'http://test.url'}} }
@@ -23,7 +23,7 @@ describe CodeharborLinksController do
   end
 
   describe 'GET #edit' do
-    let(:codeharbor_link) { FactoryBot.create(:codeharbor_link, user: user) }
+    let(:codeharbor_link) { create(:codeharbor_link, user: user) }
 
     before { get :edit, params: {id: codeharbor_link.id} }
 
@@ -57,7 +57,7 @@ describe CodeharborLinksController do
   end
 
   describe 'PUT #update' do
-    let(:codeharbor_link) { FactoryBot.create(:codeharbor_link, user: user) }
+    let(:codeharbor_link) { create(:codeharbor_link, user: user) }
     let(:put_request) { patch :update, params: {id: codeharbor_link.id, codeharbor_link: params} }
     let(:params) { {push_url: 'http://foo.bar/push', check_uuid_url: 'http://foo.bar/check', api_key: 'api_key'} }
 
@@ -92,7 +92,7 @@ describe CodeharborLinksController do
   end
 
   describe 'DELETE #destroy' do
-    let!(:codeharbor_link) { FactoryBot.create(:codeharbor_link, user: user) }
+    let!(:codeharbor_link) { create(:codeharbor_link, user: user) }
     let(:destroy_request) { delete :destroy, params: {id: codeharbor_link.id} }
 
     it 'deletes codeharbor_link' do